8th book does a really good job with Gorbad's history.

Gorbad's original history is in the 4/5th edition book. Pretty much the same, though in the old book he rode a chariot pulled by 3 wolves (yes, like Grom) in one of the key battles of his campaign.

The most important difference is the true name of Gorbad's axe is: Morgor the Mangler, not 'morglor'...it's morGOR!